i don't think he will ban cbdc since it is a product of many central banks globally. because eventually, most central banks globally will launch their own version of cbdc and all of this will be integrated into one network and make transactions easier both nationally and internationally. and as far as i know, the president also has limited authority in this matter, because the fed is independent and the president cannot control the institution directly. but if trump wants to influence the fed's decision, he might be able to do so, but it will be risky for his image, and i doubt that he would want to do that.